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a heater runs on an ac voltage of 120 v and draws a power of 26 w if this heater were run instead on a dc voltage of 70
the power brick for the authors laptop computer has a power rating of 60 w it uses a step-down transformer to convert
a fan is rotating at a rate of 740 rpm when the motor is turned off the blades slow to rest in 25 s what is the angular
a resistor with r 15 k is connected to an ac generator that operates at 60 hz with an amplitude of 49 v a find the
a transformer has an input coil with nin 400 turns and nout 1050 turns if the voltage across the input coil has an
a an electron in a hydrogen atom makes a transition from the n 5 energy stage to the ground state n1 what is the
the intensity of an earthquake waves passing though the earth is measured to be 20 x 106 jm2xs at a distance of 48km
a 10-cm-wide diffraction grating has 1300 slits it is illuminated by light of wavelength 560 nm what is the angle in
two narrow slits are illuminated by monochromatic light and an interference pattern is observed on a wall the wall is
a yo-yo-shaped device mounted on a horizontal frictionless axis is used to lift a 26 kg box as shown in the figure the
a uniform spherical shell of mass m 130 kg and radius r 0390 m can rotate about a vertical axis on frictionless
a 380 kg wheel essentially a thin hoop with radius 240 m is rotating at 460 revmin it must be brought to a stop in 230
a pulley with a rotational inertia of 11 x 10-3 kgmiddotm2 about its axle and a radius of 58 cm is acted on by a force
how fast as a percentage of light speed would a star have to be moving so that the frequency of the light we receive
monochromatic light of wavelength 600 nm illuminates a single slit of width 65 um and a diffraction pattern is created
a pulsar is a rapidly rotating neutron star that emits a radio beam the way a lighthouse emits a light beam we receive
the angular acceleration of a wheel is 50t4 ndash 30t2 with in radians per second-squared and t in seconds at time t
a cue ball mass 0165 kg is at rest on a frictionless pool table the ball is hit dead center by a pool stick which
a 210-kg ball moving to the right at a velocity of 460 ms on a frictionless table collides head-on with a stationary
a projectile mass 0259 kg is fired at and embeds itself in a target mass 193 kg the target is initially stationary
a wagon is rolling forward on level ground friction is negligible the person sitting in the wagon is holding a rock the
a beam of unpolarized light shines on a stack of five ideal polarizers set up so that the angles between the
1 find the frequency in terahertz of visible light with a wavelength of 485 nm in vacuum answerthz2 what is the
a cylinder is 010 m in radius and 020 in length its rotational inertia about the cylinder axis on which it is mounted